Optical surface production

  Optical surface production

See also mirrors for space instrumentation within the « space equipment » chapter.


ATS primary mirror
Amos has been awarded the complete design and manufacture of the ATS (Auxiliary Telescope System) which includes the telescope optics (Ritchey-Chrétien combination) with a ZERODUR lightweight hyperbolic primary mirror of 1.8 m diameter, passively mounted. Main characteristics are:

• Substrate: ZERODUR
• Diameter: 1870 mm ; edge thickness: 200 mm
• Radius of curvature: 5400.3  0.1 mm
• Conic constant: -1.00061  9.8 10 –5
• Lightweighting factor: 56 % (machined out of mass; semi-closed back structure)
• Axial supporting: whiffle tree (54 points)
• Radial supporting: 16 astatic levers and 1 central ring
• Measured wavefront error in the cell: 39 nm RMS

ATS secondary mirror
Final optical quality = 15 nm RMS WFE

ATS tertiary mirror
Final optical quality = 15 nm RMS WFE

Aluminium mirror
As part of the PLANCK Primary Reflector test bench, AMOS supplied to CSL a convex spherical mirror made of 5083 aluminium alloy.

(diameter 1520 mm; surface form error better than 1 m rms)

 

SiC experience
Silicon carbide is a hard material with the best combination of mechanical and thermal properties and hence is an ideal mirror substrate candidate.

AMOS has developed an in-house know-how in silicon carbide polishing and figuring.
This know how has been applied for different projects : GAIA, Sentinel 2 and the MAST ground-based solar telescope.




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